Journal Article

A first catalogue of automatically selected ultraviolet-excess sources from the UVEX survey

Kars Verbeek, Eelco de Groot, Paul J. Groot, Simone Scaringi, Janet Drew, Robert Greimel, Mike Irwin, Eduardo González-Solares, Boris T. Gänsicke, Jorge Casares, Jesus M. Corral-Santana, Niall Deacon and Danny Steeghs

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1115-1134
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20094.x
A first catalogue of automatically selected ultraviolet-excess sources from the UVEX survey

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We present the first catalogue of point-source ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). UVEX images the Northern Galactic Plane in the U, g, r and bands in the Galactic latitude range −5° < b < +5°. Through an automated algorithm, which works on a field-to-field basis, we select blue UV-excess sources in 211 square degrees from the (Ug) versus (gr) colour–colour diagram and the g versus (Ug) and g versus (gr) colour–magnitude diagrams. The UV-excess catalogue covers the magnitude range 14 < g < 22.5, contains 2170 sources and consists of a mix of white dwarfs, post-common-envelope objects, interacting binaries, quasars and active galactic nuclei. Two other samples of outliers were found during the selection: (i) a ‘subdwarf’ sample, consisting of no less than 9872 candidate metal-poor stars or lightly reddened main-sequence stars, and (ii) a ‘purple’ sample consisting of 803 objects, most likely a mix of reddened late M giants, T Tauri stars, planetary nebulae, symbiotic stars and carbon stars. Cross-matching the selected UV-excess catalogue with other catalogues aids with the first classification of the different populations and shows that more than 99 per cent of our selected sources are unidentified sources.

Keywords: surveys; stars: general; ISM: general; Galaxy: disc; Galaxy: stellar content; Galaxy: structure

Journal Article.  9525 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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